Definition
The activation phenomenon is psychologist Brian Sexton's name for an effect he and colleagues documented in operating-room studies: when nurses and other junior team members are given a brief, structured chance to say their names and mention any concerns at the start of a case, they are significantly more willing to raise problems and offer solutions later in the case. The intervention is small — a single named role-introduction round — but the downstream effect on team behaviour is measurable.
The phenomenon is one of the implicated mechanisms behind the WHO Surgical Safety Checklist's effect. A surgical-team introduction step that on the surface looks like social niceness is, by Sexton's evidence, a clinical intervention.
Why it matters
How it works
The intervention is a defined, named first turn. Each team member states their name and role aloud and, often, is given a moment to mention any concerns about the case ahead. The naming establishes that the person is present, recognised, and (implicitly) carries the licence to contribute. The structured invitation to raise concerns flips the default from "stay silent unless asked" to "speak unless reassured."
Sexton's measured outcome was twofold. First, in surveys, OR staff who had been through the introduction step rated team communication significantly higher than staff who had not. Second, observational studies found that those teams more often raised and resolved problems mid-case rather than discovering them only afterward. The mechanism is partly cognitive (each person knows whom to address) and partly social (each person has the recent experience of having spoken and been heard).
The construction industry's pre-meeting practice, aviation's "everyone introduces themselves to the cockpit and cabin crew" rule, and the WHO checklist's pre-incision introductions are all instances of the same design move.